Which of the following tends to be prolonged on the electrocardiogram (ECG) during a first-degree atrioventricular (AV) block?
a) PR interval
b) T wave
c) P wave
d) QRS
Answer: a) PR interval
Which of the following tends to be prolonged on the electrocardiogram (ECG) during a first-degree atrioventricular (AV) block?
a) PR interval
b) T wave
c) P wave
d) QRS
Answer: a) PR interval
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